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Öğe A SEARCH FOR LEPTONIC PHOTON, Z l , AT ALL THREE CLIC ENERGY STAGES BY USING ARTIFICIAL NEURAL NETWORKS (ANN)(Jagiellonian Univ Press, 2024) Kara, S. O.; Akkoyun, S.In this work, the possible dynamics of the massive leptonic photon Z l are reconsidered via the e + e - -> mu + mu - process at the Compact Linear Collider (CLIC) with the updated center-of-mass energies (380, 1500, and 3000 GeV). We show that new generation colliders as CLIC can observe the massive leptophilic vector boson Z l with mass up to the center-ofmass energy, provided that the leptonic coupling constant is g l >= 10 - 3 . In this study, we also estimated the cross sections by artificial neural networks using the theoretical results we obtained for CLIC. According to the results obtained, it was seen that these predictions could be made through machine learning.Öğe AGATA-Advanced GAmma Tracking Array(ELSEVIER SCIENCE BV, 2012) Akkoyun, S.; Algora, A.; Alikhani, B.; Ameil, F.; de Angelis, G.; Arnold, L.; Badoer, S.The Advanced GAmma Tracking Array (AGATA) is a European project to develop and operate the next generation gamma-ray spectrometer. AGATA is based on the technique of gamma-ray energy tracking in electrically segmented high-purity germanium crystals. This technique requires the accurate determination of the energy, time and position of every interaction as a gamma ray deposits its energy within the detector volume. Reconstruction of the full interaction path results in a detector with very high efficiency and excellent spectral response. The realisation of gamma-ray tracking and AGATA is a result of many technical advances. These include the development of encapsulated highly segmented germanium detectors assembled in a triple cluster detector cryostat, an electronics system with fast digital sampling and a data acquisition system to process the data at a high rate. The full characterisation of the crystals was measured and compared with detector-response simulations. This enabled pulse-shape analysis algorithms, to extract energy, time and position, to be employed. In addition, tracking algorithms for event reconstruction were developed. The first phase of AGATA is now complete and operational in its first physics campaign. In the future AGATA will be moved between laboratories in Europe and operated in a series of campaigns to take advantage of the different beams and facilities available to maximise its science output. The paper reviews all the achievements made in the AGATA project including all the necessary infrastructure to operate and support the spectrometer. (C) 2011 Elsevier B.V. All rights reserved.Öğe An artificial neural network application on nuclear charge radii(IOP PUBLISHING LTD, 2013) Akkoyun, S.; Bayram, T.; Kara, S. O.; Sinan, A.Artificial neural networks (ANN) have emerged with successful applications in nuclear physics as well as in many fields of science in recent years. In this paper, ANN have been employed on experimental nuclear charge radii. Statistical modeling of nuclear charge radii using ANN are seen to be successful. Based on the outputs of ANN we have estimated a new simple mass-dependent nuclear charge radii formula. Also, the charge radii, binding energies and two-neutron separation energies of Sn isotopes have been calculated by implementation of a new estimated formula in Hartree-Fock-Bogoliubov calculations. The results of the study show that the new estimated formula is useful for describing nuclear charge radii.Öğe Consistent Empirical Physical Formulas for Potential Energy Curves of 38-66Ti Isotopes by Using Neural Networks(Pleiades Publishing Inc, 2013) Akkoyun, S.; Bayram, T.; Kara, S. O.; Yildiz, N.Nuclear shape transition has been actively studied in the past decade. In particular, the understanding of this phenomenon from a microscopic point of view is of great importance. Because of this reason, many works have been employed to investigate shape phase transition in nuclei within the relativistic and nonrelativistic mean field models by examining potential energy curves (PECs). In this paper, by using layered feed-forward neural networks (LFNNs), we have constructed consistent empirical physical formulas (EPFs) for the PECs of Ti38-66 calculated by the Hartree-Fock-Bogoliubov (HFB) method with SLy4 Skyrme forces. It has been seen that the PECs obtained by neural network method are compatible with those of HFB calculations.Öğe Photonuclear Reaction Cross Sections for Gallium Isotopes(IOP PUBLISHING LTD, 2015) Akkoyun, S.; Bayram, T.; Kara, S. O.The photon induced reactions which are named as photonuclear reactions have a great importance in many field of nuclear, radiation physics and related fields. The cross-sections of neutron (photo-neutron (gamma,xn)) and proton (photo-proton (gamma,xn)) productions after photon activation have been calculated by using TALYS 1.2 computer code in this study. The target nucleus has been considered gallium which has two stable isotopes, Ga-69 and Ga-71. Furthermore, the pre-equilibrium and compound process contributions to the total cross-section have been investigated.
